Which term refers to the secure boundary that prevents unauthorized exit or entry?

• A. Sally port
• B. Checkpoint
• C. Barrier
• D. Perimeter

Answer: (D)

Think about the outer edge of a facility—the line that marks where inside security ends and the outside world begins. That outer edge, when designed to stop people from going in or out without proper authorization, is called the perimeter. It’s the overall boundary you strengthen with fencing, gates, lighting, cameras, and guards to create a defensible line. The other terms describe parts or moments of security rather than the boundary itself: a Sally port is a controlled passage used to move people or items securely; a checkpoint is a spot where credentials are verified; a barrier is any obstacle and might be part of the boundary but doesn’t name the boundary itself. So the secure boundary preventing unauthorized exit or entry is the perimeter.